I think going to see the GP or calling 111 if things don't settle over the next few days or start getting worse, especially if you are struggling with swallowing, is a good plan. The last time I had tonsillitis, I had pain and fever for 10 days and things just weren't getting better - once I got antibiotics, I was feeling better within 48 hours. Not suggesting you need antibiotics, necessarily, just pointing out that you definitely should get things checked out if things are not improving!
Hope you feel better soon!